Deadlock found when trying to get lock try restarting transaction

The integration test logs sometimes show:

Deadlock found when trying to get lock try restarting transaction

I'm not clear whether those are log messages that can be ignored, because there is retry logic in place (e.g. in/by OpenJPA?), or if this indicates real failures which we must handle with a retry logic in the code... some background:

• https://dev.mysql.com/doc/refman/8.0/en/innodb-deadlocks.html
• https://dev.mysql.com/doc/refman/8.0/en/innodb-deadlock-example.html
• https://stackoverflow.com/questions/2332768/how-to-avoid-mysql-deadlock-found-when-trying-to-get-lock-try-restarting-trans
• https://stackoverflow.com/questions/17747906/getting-deadlock-found-when-trying-to-get-lock-try-restarting-transaction/17748793
• https://dzone.com/articles/automatic-deadlock-retry
• https://github.com/SOCI/soci/issues/518

BTW: This locking issue is probably (but I'm not 100% sure..) completely unrelated to the other one tracked in FINERACT-859.